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Power door locks work when they want too

2012 peterbilt 389 power door locks work when they want to. Checked all fuses and wiring can't seem to find any loose connections. Any help would be appreciated do t really feel like taking a day off to take it to the dealer.

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behind the panel where the ashtray is there are 1 or 2 black boxes screwed to the inside 1 is the regulator for the power locks and the other is for power mirrors....

i bet you have a bad switch check them 1st...

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Wesley Steinwand will be eternally grateful.
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